I have the RCD lift on my truck with stock crappy leafs and a 4 inch block in the back. It sits perfectly but I have some off the line shudder that I am sure is accentuated by the blocks and weak leafs. I also have felt them hit the bump stops pretty easily. People seem to be happy with the expos but I don't want it to ride too rough empty. The Alcans are a complete custom job and will cost more and I want to make sure they are right if I go that route. Give me your experiences with both. Thanks